Thermometer help...

Okay, so I ran out to Lowe's this morning and grabbed a cheap accurite thermometer/hydrometer. While I was looking at it, I noticed they had a nice digital read out one too, so I grabbed that as well (I didn't see them offered online). Now the bator's up and running again, but the humidity reading on both is 10% difference. What should I do? I don't know which one is accurate.... HELP I've got eggs coming today or tomorrow.

1. You can calibrate a hydrometer by mixing in a bowl 1/2 cup of salt in 1/4 cup water. Actually a couple TBSP of salt moistened with water is enough.
2.Place bowl inside a zip lock baggie with your hydrometer. After at least 8 hours, your hygrometer should read 75%.
3. If it says, for example 80% you know that it is reading 5% to high and then you can make adjustments in your readings

To check thermometer accuracy:
Eggseronious wrote: Get a quart of ice and crush it or use a blender make an ice water mix put the thermometer down in about 2 inches and sit for 4-5 minutes should read 32* degrees make sure its a thick slush of ice water.

Well a few hours later and they're both reading within 1 degree of each other in temperature and humidity.
Thanks FK for posting the calibrating directions again, I couldn't find it to save my life.
horsegirl, I'm really bad with procrastination with everything besides incubation. The last hatch, I made sure my incubator was running stable a week and half before I got the eggs in it.